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refact: edit text in place in TextEdit::apply

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This commit is contained in:
Moritz Vetter 2022-02-26 15:50:09 +01:00
parent c541f3396c
commit 21d497b773
1 changed files with 12 additions and 18 deletions
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30
crates/text_edit/src/lib.rs
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@ -90,28 +90,22 @@ impl TextEdit {
_ => (),
}
let mut total_len = TextSize::of(&*text);
let text_size = TextSize::of(&*text);
let mut total_len = text_size.clone();
for indel in &self.indels {
total_len += TextSize::of(&indel.insert);
total_len -= indel.delete.end() - indel.delete.start();
total_len -= indel.delete.len();
}
let mut buf = String::with_capacity(total_len.into());
let mut prev = 0;
for indel in &self.indels {
let start: usize = indel.delete.start().into();
let end: usize = indel.delete.end().into();
if start > prev {
buf.push_str(&text[prev..start]);
}
buf.push_str(&indel.insert);
prev = end;
}
buf.push_str(&text[prev..text.len()]);
assert_eq!(TextSize::of(&buf), total_len);
// FIXME: figure out a way to mutate the text in-place or reuse the
// memory in some other way
*text = buf;
if let Some(additional) = total_len.checked_sub(text_size.into()) {
text.reserve(additional.into());
}
for indel in self.indels.iter().rev() {
indel.apply(text);
}
assert_eq!(TextSize::of(&*text), total_len);
}
pub fn union(&mut self, other: TextEdit) -> Result<(), TextEdit> {